Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1001
Direxion Daily Small Cap Bull 3x ETF
TNA
$1.35B
| $6.43M | 0.01% |
64,011
+1,134
| +2% | +$98.6K |
|
1002
CALL
Becton Dickinson
BDX
$42.1B
| $6.42M | 0.01% |
26,650
+102
| +0.4% | +$25K |
|
|
LSI
1003
PUT
DELISTED
Life Storage, Inc.
LSI
| $6.41M | 0.01% |
59,500
| – | – |
|
1004
PUT
Live Nation Entertainment
LYV
$41B
| $6.41M | 0.01% |
72,400
| – | – |
|
1005
CALL
NRG Energy
NRG
$30.2B
| $6.41M | 0.01% |
158,200
+15,100
| +11% | +$642K |
|
|
SPR
1006
CALL
DELISTED
Spirit AeroSystems
SPR
| $6.38M | 0.01% |
134,000
+700
| +0.5% | +$29.3K |
|
1007
CALL
Honda
HMC
$36.3B
| $6.38M | 0.01% |
197,800
| – | – |
|
1008
PUT
GFL Environmental
GFL
$14.1B
| $6.38M | 0.01% |
198,200
| – | – |
|
1009
Moderna
MRNA
$22.6B
| $6.37M | 0.01% |
27,081
-3,694
| -12% | -$1.36M |
|
1010
Newmont
NEM
$101B
| $6.36M | 0.01% |
101,222
+1,592
| +2% | +$93.9K |
|
1011
PUT
McKesson
MCK
$96.5B
| $6.36M | 0.01% |
33,000
+12,500
| +61% | +$2.5M |
|
1012
Marathon Petroleum
MPC
$91.2B
| $6.34M | 0.01% |
103,521
+1,688
| +2% | +$97.1K |
|
1013
CALL
Oshkosh
OSK
$9.48B
| $6.34M | 0.01% |
50,500
| – | – |
|
1014
CALL
Smith & Wesson
SWBI
$645M
| $6.32M | 0.01% |
178,600
+70,600
| +65% | +$1.7M |
|
1015
CALL
Clean Energy Fuels
CLNE
$460M
| $6.31M | 0.01% |
604,700
-1,100
| -0.2% | -$8.75K |
|
1016
iShares Expanded Tech-Software Sector ETF
IGV
$12.9B
| $6.31M | 0.01% |
80,845
-3,490
| -4% | -$285K |
|
1017
PUT
Check Point Software Technologies
CHKP
$13.1B
| $6.3M | 0.01% |
54,000
| – | – |
|
1018
CALL
HSBC
HSBC
$349B
| $6.29M | 0.01% |
215,400
+100
| +0% | +$2.72K |
|
1019
CALL
Western Alliance Bancorporation
WAL
$9.06B
| $6.28M | 0.01% |
65,900
+1,000
| +2% | +$97.3K |
|
1020
PUT
Boston Beer
SAM
$1.82B
| $6.28M | 0.01% |
6,500
+300
| +5% | +$204K |
|
|
FIRY
1021
PUT
Firy Inc
FIRY
$126M
| $6.28M | 0.01% |
15,405
-125
| -0.8% | -$32.3K |
|
|
SFIX
1022
CALL
Stitch Fix
SFIX
$471M
| $6.28M | 0.01% |
99,700
+2,900
| +3% | +$136K |
|
1023
PUT
DuPont de Nemours
DD
$18.6B
| $6.27M | 0.01% |
63,574
+2,310
| +4% | +$214K |
|
|
ZEN
1024
PUT
DELISTED
ZENDESK INC
ZEN
| $6.26M | 0.01% |
43,800
-100
| -0.2% | -$12.9K |
|
|
1025
PUT
NRG Energy
NRG
$30.2B
| $6.25M | 0.01% |
154,300
+10,400
| +7% | +$442K |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.